This is a PS dupe glitch so thats a Ps4 and Ps5 only.
steps for the dupe:
Drop items on floor
then quickly go to wifi
then click x twice till you come to the press to start screen
Wait 16 seconds on the 12th second go to setting and when it gets to 16 turn back on
then press start
then left/right with toggle stick and spam circle at same time
Then wait till it back you out to the press to start screen
then once thats happend press x and then click save the world
you then wanna leave party and press select game mode
press save the world
and go to storage move a item back and fourth once
then join back to your alts party
it will come up with a road block message
but then just join back to the alt